<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
     <cpn>
         <button slot="left">slot按钮</button>

     </cpn>
     <cpn></cpn>  
     <cpn></cpn>
    </div>
    <template id="cpn">
        <div>
            <h2>模板</h2>
            <!-- <slot></slot> --><!-- 无默认值 -->
            <!-- <slot><button>默认值</button></slot> -->
            <slot name="left">左边</slot>
            <slot></slot>
            <slot></slot>

        </div>
    </template>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: '#app',
            data: {
                message: 'Hello Vue!'
            },
            components:{
                cpn: {
                    template:"#cpn"
                }
            }
        })
    </script>
</body>
</html>